The NATO Advanced Research Workshop on Coherent Optical Processes in Semiconductors was held in Cambridge, England on August 11-14,1993. The idea of holding this Workshop grew from the recent upsurge in activity on coherent transient effects in semiconductors. The development of this field reflects advances in both light sources and the quality of semiconductor structures, such that tunable optical pulses are now routinely available whose duration is shorter than the dephasing time for excitonic states in quantum wells. It was therefore no surprise to the organisers that as the programme developed, there emerged a heavy emphasis on time-resolved four-wave mixing, particularly in quantum wells. Nevertheless, other issues concerned with coherent effects ensured that several papers on related problems contributed some variety. The topics discussed at the workshop centred on what is a rather new field of study, and benefited enormously by having participants representing many of the principal groups working in this area. Several themes emerged through the invited contributions at the Workshop. One important development has been the careful examination of the two-level model of excitonic effects; a model which has been remarkably successful despite the expected complexities arising from the semiconductor band structure. Indeed, modest extensions to the two level model have been able to offer a useful account for some of the complicated polarisation dependence of four-wave mixing signals from GaAs quantum wells. This work clearly is leading to an improved understanding of excitons in confined systems.

The NATO Advanced Research Workshop on Coherent Optical Processes in Semiconductors was held in Cambridge, England on August 11-14,1993. The idea of holding this Workshop grew from the recent upsurge in activity on coherent transient effects in semiconductors. The development of this field reflects advances in both light sources and the quality of semiconductor structures, such that tunable optical pulses are now routinely available whose duration is shorter than the dephasing time for excitonic states in quantum wells. It was therefore no surprise to the organisers that as the programme developed, there emerged a heavy emphasis on time-resolved four-wave mixing, particularly in quantum wells. Nevertheless, other issues concerned with coherent effects ensured that several papers on related problems contributed some variety. The topics discussed at the workshop centred on what is a rather new field of study, and benefited enormously by having participants representing many of the principal groups working in this area. Several themes emerged through the invited contributions at the Workshop. One important development has been the careful examination of the two-level model of excitonic effects; a model which has been remarkably successful despite the expected complexities arising from the semiconductor band structure. Indeed, modest extensions to the two level model have been able to offer a useful account for some of the complicated polarisation dependence of four-wave mixing signals from GaAs quantum wells. This work clearly is leading to an improved understanding of excitons in confined systems.

God does not intend for us to fight our battles alone. Our battles do not disqualify us from his grace-no matter what they are. The two CORE for Men studies-Redeemed and Transformed-each feature five raw and real video stories (DVD/video streaming sold separately) of men who have fought with feelings of isolation and disqualification. Through these personal stories of brokenness and redemption, you and your group will be encouraged to step out of shame and into your own God-shaped stories. Sessions and Contributors include: Called (Mariano Rivera, pitcher for New York Yankees) Redemption (Kyle Oxford, tattoo artist) Sons (Tommy Green, lead singer for the metal/hardcore band Sleeping Giant) Restoration (Robert Irving III, music director for Miles Davis) Purpose (Tom Paterson, master strategic thinker) Brought to you by the men behind the organization Promise Keepers, the passion behind the CORE for Men studies is to create spaces where men have permission to be real-where men discover they are not alone with the kind of doubts and fears they face everyday. CORE is a biblical expression of solidarity that will lead you back to a God who's in the business of turning brokenness into forgiveness and pain into a new and fulfilling purpose. Designed for use with the Redeemed: Turning Brokenness into Something Beautiful Video Study available on DVD or streaming video, sold separately.

God has redeemed you. Now he's transforming you. Unlike redemption, we have to participate in our own spiritual transformation...but God doesn't ask us to do it alone. The two CORE for Men studies-Redeemed and Transformed-each feature five raw and real video stories (DVD/video streaming sold separately) of men who have fought with feelings of isolation and disqualification. Through these personal stories of brokenness and transformation, you and your group will be encouraged to step out of stagnancy and into your own God-shaped stories. Sessions and Contributors include: Identity (Propaganda, poet and activist) Transformation (Willie Alfonso, chaplain for the New York Yankees) Brotherhood (Sam & Emmanuel Acho, NFL players) Choices (Jerry Quiroz, professional soccer player) Reload (Clint Bruce, US Navy SEAL) Brought to you by the men behind the organization Promise Keepers, the passion behind the CORE for Men studies is to create spaces where men have permission to be real-where men discover they are not alone with the kind of doubts and fears they face everyday. CORE is a biblical expression of solidarity that will lead you back to a God who's in the business of turning brokenness into forgiveness and pain into a new and fulfilling purpose. Designed for use with the Transformed: Embracing Our True Identity and Purpose Video Study available on DVD or streaming video, sold separately.